The 1st automatic transmission to implement a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released for the 1948 product 12 months. In standard driving, the Dynaflow used just the leading equipment, relying on the torque multiplication with the torque convertor at reduce speeds. https://gearboxauto99741.vblogetin.com/39870500/the-basic-principles-of-gearbox-auto